Fault Feeder Identification in Non-effectively Grounded Distribution Network with Secondary Earth Fault  

作　　者：Shu Zhang Tianlei Zang Wenhai Zhang Xianyong Xiao 

机构地区：[1]Department of Electrical Engineering,Sichuan University,Chengdu,China

出　　处：《Journal of Modern Power Systems and Clean Energy》2021年第5期1137-1148,共12页现代电力系统与清洁能源学报（英文）

基　　金：This work was supported in part by National Science Foundation of China(No.51907097);National Key R&D Program of China(No.2020YFF0305800);the Full-time Postdoc Research and Development Fund of Sichuan University in China(No.2019SCU12003);the Applied Basic Research of Sichuan Province(No.2020YJ0012).

摘　　要：Secondary earth faults occur frequently in power distribution networks under harsh weather conditions.Owing to its characteristics,a secondary earth fault is typically hidden within the transient of the first fault.Therefore,most researchers tend to focus on a feeder with single fault while disregarding secondary faults.This paper presents a fault feeder identification method that considers secondary earth faults in a non-effectively grounded distribution network.First,the wavelet singular entropy method is used to detect a secondary fault event.This method can identify the moment at which a secondary fault occurs.The zero-sequence current data can be categorized into two fault stages.The first and second fault stages correspond to the first and secondary faults,respectively.Subsequently,a similarity matrix containing the time-frequency transient information of the zero-sequence current at the two fault stages is defined to identify the fault feeders.Finally,to confirm the effectiveness and reliability of the proposed method,we conduct simulation experiments and an adaptability analysis based on an electromagnetic transient program.

关 键 词：Secondary earth fault non-effectively grounded distribution network wavelet singular entropy similarity matrix zero-sequence current 

分 类 号：TM862[电气工程—高电压与绝缘技术]